CN114217242A - Short circuit detection method, short circuit protection device and computer readable storage medium - Google Patents

Short circuit detection method, short circuit protection device and computer readable storage medium Download PDF

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CN114217242A
CN114217242A CN202111016973.0A CN202111016973A CN114217242A CN 114217242 A CN114217242 A CN 114217242A CN 202111016973 A CN202111016973 A CN 202111016973A CN 114217242 A CN114217242 A CN 114217242A
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load current
current sampling
sum
short circuit
storage
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袁卿卿
王建忠
周宣
刘新润
赵言涛
周为
彭国亮
王彬任
薛雷
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Wasion Group Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/52—Testing for short-circuits, leakage current or ground faults
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current

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Abstract

The invention discloses a short circuit detection method, a short circuit protection device and a readable storage medium, wherein a load current analog signal is collected, the load current analog signal is converted into a load current sampling value, and the load current sampling value is stored in a storage queue; judging whether the number of load current sampling values in the storage queue is equal to a preset period sampling number or not; if yes, calculating the square sum of the load current sampling values in the storage queue; and judging whether the load has a short circuit or not according to the comparison result of the square sum threshold value corresponding to the square sum and the preset short circuit current. The invention can solve the problem of long time consumption for judging the short-circuit fault.

Description

Short circuit detection method, short circuit protection device and computer readable storage medium
Technical Field
The invention relates to the field of power measurement, in particular to a short circuit detection method, a short circuit protection device and a readable storage medium.
Background
When the insulation of the electric appliance or the wiring in the electric control circuit is damaged, the load is short-circuited, and the wiring is wrong, a short-circuit fault is generated. The instantaneous fault current generated during short circuit is dozens to tens of times of rated current. The strong electromotive force generated by the electrical equipment or the distribution line due to the short-circuit current may damage, generate an arc, and even cause a fire. Short-circuit protection requires that the power supply be disconnected within a very short time after the short-circuit fault has occurred, a common method being to connect a fuse and an air switch in series in the line. However, in an actual short-circuit scenario, the tripping time of the overcurrent release inside the air switch is relatively long, generally ranging from tens of milliseconds to hundreds of milliseconds, and the air switch may affect the normal power consumption of other sub-circuits under the air switch.
Disclosure of Invention
The invention provides a short circuit detection method, a short circuit protection device and a computer readable storage medium, and aims to solve the problem that the short circuit fault judgment consumes too long time.
In order to achieve the above object, the present invention provides a method for detecting a short circuit, comprising the steps of:
collecting a load current analog signal, converting the load current analog signal into a load current sampling value, and storing the load current sampling value into a storage queue;
judging whether the number of load current sampling values in the storage queue is equal to a preset periodic sampling number or not;
if yes, calculating the square sum of the load current sampling values in the storage queue;
and judging whether the load has a short circuit or not according to the comparison result of the square sum threshold value corresponding to the square sum and the preset short circuit current.
Alternatively,
Figure RE-GDA0003498712280000021
Figure RE-GDA0003498712280000022
wherein the SUMsquare_ThThe sum of squares threshold corresponding to the preset short-circuit current is set; i (n) is the current sampling value of the nth sampling point;
Figure RE-GDA0003498712280000023
the sum of squares of N load current sampling values; i isRMSIs a preset short-circuit current effective value; kiNormalizing the coefficient for a preset current effective value; and N is the number of sampling points in the period.
Alternatively,
Figure RE-GDA0003498712280000024
wherein the SUMsquare0The sum of squares of load current sampling values at the previous sampling moment; SUMsquare1The sum of squares of load current sampling values at the current sampling moment; i.e. iAt presentThe sampling value of the load current at the current sampling moment is obtained; i.e. iAt the earliest stageA load current sampling value corresponding to the earliest data in the storage queue;
Figure RE-GDA0003498712280000025
wherein, i (n) is the current sampling value of the nth sampling point;
Figure RE-GDA0003498712280000026
for the first M-1 load current sample values sum of squares, i2(M) is the Mth load current sampling value, M is the number of sampling points, and M is less than the number of periodic sampling。
Optionally, if the total number of the load current sampling values in the storage queue is not equal to the preset number of sampling cycles, calculating a sum of squares of the load current sampling values in the storage queue, and executing the step of collecting the load current analog signal.
Optionally, judging whether the number of load current sampling values in the storage queue is equal to a preset period sampling number or not;
and if the number of the load current sampling values in the storage queue is not equal to the preset period sampling number, storing the load current sampling values into a first vacant storage position in the storage queue.
Optionally, judging whether the number of load current sampling values in the storage queue is zero or not;
and if the number of the load current sampling values in the storage queue is zero, setting the load current sampling values as the earliest data, and storing the load current sampling values into a first storage position in the storage queue.
Optionally, if the number of load current sampling values in the storage queue is equal to a preset period sampling number, covering the load current sampling values with the earliest data in the storage queue;
judging whether the storage position of the load current sampling value is the last storage position in the storage queue or not;
if the storage position of the load current sampling value is the last storage position in the storage queue, updating the load current sampling value on the first storage position in the storage queue to be the earliest data;
and if the storage position of the load current sampling value is not the last storage position in the storage queue, updating the load current sampling value at the next storage position of the load current sampling value to the earliest data.
Optionally, judging whether the sum of squares of the load current values in the periodic sampling number is greater than a sum of squares threshold corresponding to a preset short-circuit current;
judging whether the sum of squares of the load current values in the storage queue is greater than a sum of squares threshold corresponding to a preset short-circuit current;
and if the sum of squares of the load current values in the storage queue is greater than the threshold value of the sum of squares corresponding to the preset short-circuit current, judging that the short circuit exists.
In order to achieve the above object, the present application also proposes a short circuit protection device, which includes a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the computer program, when executed by the processor, implements the short circuit detection method.
To achieve the above object, the present application further proposes a readable storage medium having a computer program stored thereon, which when executed by a processor implements the method for detecting a short circuit.
In the technical scheme of the invention, a load current analog signal is collected, the load current analog signal is converted into a load current sampling value, and the load current sampling value is stored in a storage queue; judging whether the total number of the load current sampling values in the storage queue is equal to the preset period sampling number or not; when the total number of the load current sampling numbers in the storage queue is equal to the preset period sampling number, calculating the square sum of the load current sampling values in the period sampling number; and judging whether the load has a short circuit or not according to the comparison result of the square sum of the load current values in the periodic sampling number and the square sum threshold corresponding to the preset short circuit current. The analog electric signal is converted into the load current sampling value with a determined value, the square sum of the load current sampling value is compared with the square sum threshold value corresponding to the preset short-circuit current, whether short circuit occurs or not is judged according to the comparison result, and due to the fact that the frequency of signal collection and comparison is high, delay is hardly generated by the short circuit judging mode, and normal electricity utilization of other sub-loops is not influenced.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic block diagram of a short circuit detection method according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method for detecting a short circuit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a short-circuit protection device according to an embodiment of the present invention;
FIG. 4 is a diagram illustrating a memory according to another embodiment of the present invention.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, fig. 1 is a schematic diagram of a hardware structure of a short-circuit protection device provided in various embodiments of the present invention. The short-circuit protection device comprises an execution module 01, a memory 02, a processor 03 and the like. Those skilled in the art will appreciate that the short-circuit protection arrangement shown in fig. 1 may also include more or fewer components than those shown, or some components may be combined, or a different arrangement of components. The processor 03 is connected to the memory 02 and the execution module 01, respectively, and the memory 02 stores a computer program, which is executed by the processor 03 at the same time.
The execution module 01 can collect voltage analog signals or current analog signals in the short-circuit protection device, control the on-off of the circuit through an electronic switch, and feed back the information to the processor 03.
The memory 02 may be used to store software programs and various data. The memory 02 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function, and the like; the storage data area may store data or information created according to the use of the terminal, or the like. Further, the memory 02 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device.
The processor 03, which is a control center of the processing platform, connects various parts of the entire terminal by using various interfaces and lines, and performs various functions of the terminal and processes data by running or executing software programs and/or modules stored in the memory 02 and calling data stored in the memory 02, thereby performing overall monitoring of the short-circuit protection device. Processor 03 may include one or more processing units; preferably, the processor 03 may integrate an application processor, which mainly handles operating systems, user interfaces, application programs, etc., and a modem processor, which mainly handles wireless communications. It will be appreciated that the modem processor described above may not be integrated into the processor 03.
It will be understood by those skilled in the art that the short circuit protection arrangement shown in fig. 1 does not constitute a limitation of the short circuit protection arrangement and may include more or fewer components than shown, or some components in combination, or a different arrangement of components.
Various embodiments of the method of the present invention are presented in terms of the above-described hardware architecture.
Referring to fig. 2, in a first embodiment of the short circuit detection method of the present invention, the short circuit detection method includes:
step S100, collecting a load current analog signal, converting the load current analog signal into a load current sampling value, and storing the load current sampling value into a storage queue;
when the insulation of the electric appliance or the wiring in the electric control circuit is damaged, the load is short-circuited, and the wiring is wrong, a short-circuit fault is generated. The instantaneous fault current generated during short circuit is dozens to tens of times of rated current. The strong electromotive force generated by the electrical equipment or the distribution line due to the short-circuit current may damage, generate an arc, and even cause a fire. Short-circuit protection requires that the power supply be disconnected within a very short time after the short-circuit fault has occurred, a common method being to connect a fuse and an air switch in series in the line. And secondly, current-voltage relay protection by using sudden increase of current and sudden decrease of voltage.
When the air switch sends a short circuit on a line, the overcurrent release of the air switch acts to cut off the power supply, so that the purpose of short circuit protection is achieved. However, in an actual short-circuit scenario, the tripping time of the overcurrent release inside the air switch is relatively long, typically several tens of milliseconds to several hundreds of milliseconds. In addition, the air switch is generally installed in the main loop, if one of the sub-loops is short-circuited, the air switch acts, and the other sub-loops cannot normally use electricity, which affects the normal electricity use of the other sub-loops under the air switch.
The fuse is mainly composed of a fuse body, a fuse tube, an additional filler and the like. When the fuse protector is used, the fuse protector is connected in series in a protected circuit, and when overload or short-circuit current passes through the melt, the melt is heated and fused, so that a certain protection effect is achieved on a power system, various electrical equipment and household appliances. However, after the fuse is fused, a new fuse needs to be replaced, and the melt is used for too long time, so that the melt is mistakenly broken due to the change of the melt characteristics caused by oxidation or high temperature in operation; and some self-resetting fuses adopt metallic sodium as a melt and have high conductivity at normal temperature. When the short-circuit fault occurs in the circuit, the short-circuit current generates high temperature to quickly vaporize sodium, and the vaporous sodium presents a high resistance state, so that the short-circuit current is limited. When the short-circuit current disappears, the temperature drops, and the metal sodium recovers the original good conductive performance. The self-resetting fuse can only limit short-circuit current, cannot really break a circuit and is expensive.
In this embodiment, the load current analog signal passing through the load is an alternating current signal, one load current analog signal is collected at each sampling time, and then the load current analog signal is input to an analog-to-digital converter in an SOC (system on chip) controller, the analog-to-digital converter can convert the load current analog signal into a load current sampling value and store the load current sampling value in a preset storage module, a storage queue exists in the storage module, and the load current sampling values are sequentially stored according to the storage queue. Because the load current analog signal is an analog signal, the amplitude of the analog signal continuously changes along with time and cannot be directly stored and calculated, and the converted load current sampling value is a discrete digital signal, has a specific value and can be subjected to various operations, the load current analog signal is converted into the load current sampling value, and subsequent storage and operation can be facilitated.
Step S200, judging whether the number of load current sampling values in the storage queue is equal to the number of sampling values in a preset period or not;
in some embodiments, the storage module may be a specific storage area dedicated to storing the load current sampling value in the memory, or may be an entire block of the memory. The memory space in the memory module is limited and after power-up of the circuit only two situations may occur in the memory module, i.e. the memory module is full or not. Typically, the memory module can only accommodate one cycle of load current samples. If the load current sampling value stored in the storage module is less than the preset period sampling number, the storage module is not fully stored, after the storage module stores the load current sampling value of one period, if a new load current sampling value needs to be stored, only the existing load current sampling value in the storage module can be covered, and no matter what rule is used for covering, a new load current sampling value only covers the existing load current sampling value, so that once the storage module is fully stored, the number of the load current sampling values in the storage module is always equal to the preset period sampling number no matter how many load current sampling values are stored subsequently. In the embodiment, after the load current sampling values are stored in the storage queue, whether the total number of the load current sampling values in the storage queue is equal to the preset period sampling number or not is judged; and different subsequent steps are performed according to different results.
Step S300, if yes, calculating the square sum of the load current sampling values in the storage queue;
and step S400, judging whether the load has a short circuit according to the comparison result of the square sum threshold value corresponding to the square sum and the preset short circuit current.
In an embodiment, after the step of determining whether the total number of the load current sampling values in the storage queue is equal to the preset period sampling number, the method further includes:
and if the total number of the load current sampling values in the storage queue is not equal to the preset sampling period number, calculating the sum of squares of the load current sampling values in the storage queue, and executing the step of acquiring the load current analog signal.
In this embodiment, the sum of squares of all load current sampling values in the storage module is calculated no matter whether the total number of load current sampling values in the storage queue reaches the preset period sampling number. The difference is that when the total number of the load current sampling values in the storage queue does not reach the preset sampling period number, the square sum of the load current sampling values is calculated, and then the next load current analog signal is directly collected without comparing the square sum with the square sum threshold value corresponding to the preset short-circuit current; and when the total number of the load current sampling values in the storage queue reaches the preset sampling period number, calculating the square sum of the load current sampling values in the period sampling number, comparing the square sum with the square sum threshold value corresponding to the preset short-circuit current, and judging whether the load has a short circuit according to the comparison result. Since the frequency of signal acquisition, calculation of the sum of squares, and comparison of the sum of squares with the threshold is high, it is generally set to sample 72 or 144 times per sampling period, specifically, 50 full waves per second. If a sampling period is defined as a half cycle, sampling is carried out for 72 times in each sampling period; if a sampling period is defined as a full wave, then each sampling period is sampled 144 times. Accordingly, 7200 samples per second. Therefore, the short circuit judgment mode hardly generates delay, the short circuit can be found in the circuit in a very short time after the short circuit occurs, the short circuit event is reported to the SOC controller after the short circuit is found, and the SOC controller controls the quick electronic switch circuit to disconnect the load circuit after receiving the short circuit information so as to prevent the occurrence of an electrical fire or a casualty event.
In an embodiment, the sum of squares threshold corresponding to the preset short-circuit current is:
Figure RE-GDA0003498712280000081
wherein the SUMsquare_ThThe sum of squares threshold corresponding to the preset short-circuit current is set; i (n) is the current sampling value of the nth sampling point;
Figure RE-GDA0003498712280000082
the sum of squares of N load current sampling values; i isRMSIs a preset short-circuit current effective value; kiNormalizing the coefficient for a preset current effective value; and N is the number of sampling points in the period.
In this embodiment, the
Figure RE-GDA0003498712280000083
Viewed as a whole, which represents the sum of the squares of the N load current sample values, and, in addition, the short-circuit current effective value
Figure RE-GDA0003498712280000084
By modifying the above formula:
Figure RE-GDA0003498712280000085
Figure RE-GDA0003498712280000086
the above formula gives the derivation process of the square sum threshold corresponding to the preset short-circuit current, that is, the square of the product of the current effective value normalization coefficient and the preset short-circuit current effective value is multiplied by the number of sampling points in the period.
In one embodiment, the sum of squares of the load current samples in the store queue comprises:
Figure RE-GDA0003498712280000087
wherein the SUMsquare0The sum of squares of load current sampling values at the previous sampling moment; SUMsquare1The sum of squares of load current sampling values at the current sampling moment; i.e. iAt presentThe sampling value of the load current at the current sampling moment is obtained; i.e. iAt the earliest stageFor the earliest in the store queueLoad current sampling values corresponding to the data; wherein:
Figure RE-GDA0003498712280000088
wherein, i (n) is the current sampling value of the nth sampling point;
Figure RE-GDA0003498712280000089
for the first M-1 load current sample values sum of squares, i2And (M) is the Mth load current sampling value, M is the number of sampling points, and M is smaller than the periodic sampling number.
In one embodiment, the step of storing the load current sample value in a storage queue comprises:
judging whether the number of load current sampling values in the storage queue is equal to the preset period sampling number or not;
and if the number of the load current sampling values in the storage queue is not equal to the preset period sampling number, storing the load current sampling values into a first vacant storage position in the storage queue.
The memory module has limited memory space and typically can only accommodate one cycle of load current samples. Thus, after power-up of the circuit, only two situations may occur in the memory module, i.e. the memory module is full or not. In this embodiment, when the storage module is in two states of being full or not being full, the storage modes of the load current sampling values are different, so before storing a new load current sampling value into the storage queue, it is necessary to first determine whether the total number of the sampling data in the storage queue is equal to the preset period sampling number, and if the total number of the sampling data is not equal to the preset period sampling number, it means that the storage module is not full at this time, and only the new load current sampling value needs to be stored into the next storage location of the latest data in the storage queue of the storage module. If the total number of the sampling data is equal to the sampling number of the preset period, the storage module is full, and at the moment, the load current sampling value stored in the storage module at the earliest time needs to be covered by a new load current sampling value, so that the data in the storage module is always the latest group of data, and the accuracy and the real-time performance of the judgment on the short circuit are ensured.
In an embodiment, the step of determining whether the total number of the sample data in the storage queue is equal to the preset number of samples in the period comprises:
judging whether the number of load current sampling values in the storage queue is zero or not;
and if the number of the load current sampling values in the storage queue is zero, setting the load current sampling values as the earliest data, and storing the load current sampling values into a first storage position in the storage queue.
Since each new load current sample needs to overwrite the oldest load current sample, i.e., the oldest data, in the memory module after the memory module is full, to ensure that the data in the memory module is always the newest set of data. Therefore, an earliest data needs to be set in the storage queue first. In this embodiment, after the total number of the sampled data in the storage queue is determined not to be equal to the preset period sample number, it is continuously determined whether the total number of the sampled data in the storage queue is zero, and if the total number of the sampled data in the storage queue is zero, it means that the storage module is empty. That is, the load current sample value to be stored at this time is the first load current sample value obtained after power-on, and therefore, the load current sample value is set as the earliest data while the load current sample value is stored. Through the step of presetting the earliest data, the new load current sampling value can still be stored in order after the storage module is full, and data loss in the storage process is avoided.
In an embodiment, the step of determining whether the number of load current sampling values in the storage queue is equal to the preset number of periodic sampling values includes:
if the number of the load current sampling values in the storage queue is equal to the preset period sampling number, covering the load current sampling values with the earliest data in the storage queue;
judging whether the storage position of the load current sampling value is the last storage position in the storage queue or not;
if the storage position of the load current sampling value is the last storage position in the storage queue, updating the load current sampling value on the first storage position in the storage queue to be the earliest data;
and if the storage position of the load current sampling value is not the last storage position in the storage queue, updating the load current sampling value at the next storage position of the load current sampling value to the earliest data.
In this embodiment, before the load current sampling value is stored, if it is determined that the total number of the sampling data in the storage queue is equal to the preset cycle sampling number, that is, the storage space of the storage module is occupied, the load current sampling value is covered with the earliest data in the storage queue. Since the updated load current sample value, which also needs to be overwritten with the oldest data, will be stored in the memory module in the future, it is necessary to set a new oldest data after overwriting the oldest data this time. In this embodiment, after the current load current sampling value covers the earliest data, it is necessary to determine whether the storage location of the current load current sampling value is the last storage location in the storage queue, and according to the storage rule, the current load current sampling value is updated to the earliest data if the storage location of the current load current sampling value is the last storage location in the storage queue; and if the storage position of the load current sampling value is not the last storage position in the storage queue, updating the load current sampling value on the next storage position in the storage queue to the earliest data. By the mode of continuously updating the earliest data, when each new load current sampling value is stored in the storage module, the load current sampling value stored in the storage module earliest can be covered just, so that the data in the storage module is always the latest group of data, and the short-circuit fault in the circuit can be found timely.
In an embodiment, the step of determining whether the load has a short circuit according to a comparison result of a sum of squares of load current values within the periodic sampling number and a sum of squares threshold corresponding to a preset short circuit current includes:
judging whether the sum of squares of the load current values in the storage queue is greater than a sum of squares threshold corresponding to a preset short-circuit current;
and if the sum of squares of the load current values in the storage queue is greater than the threshold value of the sum of squares corresponding to the preset short-circuit current, judging that the short circuit exists.
And if the square sum of the load current values in the periodic sampling number is less than or equal to the square sum threshold corresponding to the preset short-circuit current, judging that no short circuit exists.
In this embodiment, the instantaneous fault current generated in the circuit at the time of short circuit is ten or more or even several tens times the rated current. Therefore, under the condition that the circuit is normal, the square sum of the load current values in the periodic sampling number is less than or equal to the square sum threshold corresponding to the preset short-circuit current. Therefore, if the sum of squares of the load current values in the periodic sampling number is less than or equal to the sum of squares threshold corresponding to the preset short-circuit current, judging that no short circuit exists; if the sum of squares of the load current values in the periodic sampling number is larger than the sum of squares threshold corresponding to the preset short-circuit current, the occurrence of short circuit is judged, and at the moment, a load loop needs to be cut off quickly, so that electric appliances in the circuit are prevented from being damaged, even fire disasters occur, and casualties are avoided.
In addition, fig. 3 is an embodiment of the present disclosure, the short-circuit protection device may further collect voltage analog signals at two ends of the short-circuit protection device, and the voltage analog signals may be used to calculate related parameters such as power and power factor, and the parameters may be used to determine whether the circuit is abnormal, and if the circuit is abnormal, the electronic switch may be turned off by the controller. In addition, the resistance of the resistor in fig. 3 is a sampling resistor, which is very small and can be a manganin resistor, and the current sampling circuit can measure the voltage at the two ends of the manganin resistor and calculate the current actually flowing through the manganin resistor according to the voltage at the two ends of the manganin resistor.
Fig. 4 is a schematic diagram of a memory module according to an embodiment of the present disclosure.
The invention also proposes a short-circuit protection device comprising a memory, a processor, and a computer program stored on said memory and executable on said processor for performing the method according to the various embodiments of the invention.
The invention also proposes a readable storage medium on which the computer program is stored. The computer-readable storage medium may be the Memory in fig. 1, and may also be at least one of a ROM (Read-Only Memory)/RAM (Random Access Memory), a magnetic disk, and an optical disk, and the computer-readable storage medium includes several instructions for enabling a terminal device (which may be a mobile phone, a computer, a server, a terminal, or a network device) having a processor to execute the method according to the embodiments of the present invention.
In the present invention, the terms "first", "second", "third", "fourth" and "fifth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance, and those skilled in the art can understand the specific meanings of the above terms in the present invention according to specific situations.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although the embodiment of the present invention has been shown and described, the scope of the present invention is not limited thereto, it should be understood that the above embodiment is illustrative and not to be construed as limiting the present invention, and that those skilled in the art can make changes, modifications and substitutions to the above embodiment within the scope of the present invention, and that these changes, modifications and substitutions should be covered by the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A short circuit detection method is applied to a short circuit protection device, and comprises the following steps:
collecting a load current analog signal, converting the load current analog signal into a load current sampling value, and storing the load current sampling value into a storage queue;
judging whether the number of load current sampling values in the storage queue is equal to a preset period sampling number or not;
if yes, calculating the square sum of the load current sampling values in the storage queue;
and judging whether the load has a short circuit or not according to the comparison result of the square sum threshold value corresponding to the square sum and the preset short circuit current.
2. The method for detecting a short circuit according to claim 1, wherein the preset short circuit current corresponds to a sum of squares threshold as follows:
Figure RE-FDA0003389463010000011
wherein the SUMsquare_ThThe sum of squares threshold corresponding to the preset short-circuit current is set; i (n) is the current sampling value of the nth sampling point;
Figure RE-FDA0003389463010000012
the sum of squares of N load current sampling values; i isRMSIs a preset short-circuit current effective value; kiNormalizing the coefficient for a preset current effective value; and N is the number of sampling points in the period.
3. The short circuit detection method of claim 1, wherein the sum of squares of the load current samples in the store queue comprises:
Figure RE-FDA0003389463010000013
wherein the SUMsquare0The sum of squares of load current sampling values at the previous sampling moment; SUMsquare1The sum of squares of load current sampling values at the current sampling moment; i.e. iAt presentThe sampling value of the load current at the current sampling moment is obtained; i.e. iAt the earliest stageA load current sampling value corresponding to the earliest data in the storage queue;
Figure RE-FDA0003389463010000014
wherein, i (n) is the current sampling value of the nth sampling point;
Figure RE-FDA0003389463010000021
for the first M-1 load current sample values sum of squares, i2And (M) is the Mth load current sampling value, M is the number of sampling points, and M is smaller than the periodic sampling number.
4. The method for detecting a short circuit as claimed in claim 1, wherein after the step of determining whether the number of load current samples in the storage queue is equal to a predetermined number of periodic samples, the method further comprises:
and if the total number of the load current sampling values in the storage queue is not equal to the preset sampling period number, calculating the sum of squares of the load current sampling values in the storage queue, and executing the step of acquiring the load current analog signal.
5. The method of claim 1, wherein the step of storing the load current samples in a memory queue comprises:
judging whether the number of load current sampling values in the storage queue is equal to the preset period sampling number or not;
and if the number of the load current sampling values in the storage queue is not equal to the preset period sampling number, storing the load current sampling values into a first vacant storage position in the storage queue.
6. The method of short circuit detection as claimed in claim 5 wherein said step of storing said load current sample value in a first empty memory location of said memory queue comprises:
judging whether the number of load current sampling values in the storage queue is zero or not;
and if the number of the load current sampling values in the storage queue is zero, setting the load current sampling values as the earliest data, and storing the load current sampling values into a first storage position in the storage queue.
7. The method of claim 5, wherein the step of determining whether the number of load current samples in the store queue equals a predetermined number of periodic samples is followed by the step of:
if the number of the load current sampling values in the storage queue is equal to the preset period sampling number, covering the load current sampling values with the earliest data in the storage queue;
judging whether the storage position of the load current sampling value is the last storage position in the storage queue or not;
if the storage position of the load current sampling value is the last storage position in the storage queue, updating the load current sampling value on the first storage position in the storage queue to be the earliest data;
and if the storage position of the load current sampling value is not the last storage position in the storage queue, updating the load current sampling value at the next storage position of the load current sampling value to the earliest data.
8. The method for detecting a short circuit according to claim 1, wherein the step of determining whether the load has a short circuit according to the comparison result of the sum of squares and the threshold value corresponding to the preset short circuit current comprises:
judging whether the sum of squares of the load current values in the storage queue is greater than a sum of squares threshold corresponding to a preset short-circuit current;
and if the sum of squares of the load current values in the storage queue is greater than the threshold value of the sum of squares corresponding to the preset short-circuit current, judging that the short circuit exists.
9. A short-circuit protection device, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, the computer program, when executed by the processor, implementing the steps of the method of detecting a short-circuit according to any one of claims 1 to 8.
10. A readable storage medium, characterized in that the readable storage medium has stored thereon a computer program which, when being executed by a processor, carries out the steps of the method of detection of a short circuit according to any one of claims 1 to 8.
CN202111016973.0A 2021-08-31 2021-08-31 Short circuit detection method, short circuit protection device and computer readable storage medium Pending CN114217242A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115219769A (en) * 2022-09-20 2022-10-21 江苏东成工具科技有限公司 Current detection method, electric tool and computer readable medium
WO2024073929A1 (en) * 2022-10-05 2024-04-11 Hong Kong Applied Science and Technology Research Institute Company Limited Method of identifying a short-circuit like event in a circuit breaker

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115219769A (en) * 2022-09-20 2022-10-21 江苏东成工具科技有限公司 Current detection method, electric tool and computer readable medium
WO2024073929A1 (en) * 2022-10-05 2024-04-11 Hong Kong Applied Science and Technology Research Institute Company Limited Method of identifying a short-circuit like event in a circuit breaker
US12055601B2 (en) 2022-10-05 2024-08-06 Hong Kong Applied Science and Technology Research Institute Co. Ltd Method of identifying a short-circuit like event in a circuit breaker

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